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authorAdrian Kummerlaender2019-02-04 21:30:45 +0100
committerAdrian Kummerlaender2019-06-24 15:17:42 +0200
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Restructure refined cylinder2d example folders
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+/*
+ * Lattice Boltzmann grid refinement sample, written in C++,
+ * using the OpenLB library
+ *
+ * Copyright (C) 2019 Adrian Kummerländer
+ * E-mail contact: info@openlb.net
+ * The most recent release of OpenLB can be downloaded at
+ * <http://www.openlb.net/>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "olb2D.h"
+#ifndef OLB_PRECOMPILED
+#include "olb2D.hh"
+#endif
+
+#include <vector>
+
+using namespace olb;
+
+typedef double T;
+
+#define DESCRIPTOR descriptors::D2Q9Descriptor
+
+/// Setup geometry relative to cylinder diameter as defined by [SchaeferTurek96]
+const T cylinderD = 0.1;
+const int N = 10; // resolution of the cylinder
+const T deltaR = cylinderD / N; // coarse lattice spacing
+const T lx = 22*cylinderD + deltaR; // length of the channel
+const T ly = 4.1*cylinderD + deltaR; // height of the channel
+const T cylinderX = 2*cylinderD;
+const T cylinderY = 2*cylinderD + deltaR/2;
+
+const T Re = 100.; // Reynolds number
+const T tau = 0.51; // relaxation time
+const T maxPhysT = 16.; // max. simulation time in s, SI unit
+
+const Characteristics<T> PhysCharacteristics(
+ 0.1, // char. phys. length
+ 1.0, // char. phys. velocity
+ 0.1/Re, // phsy. kinematic viscosity
+ 1.0); // char. phys. density
+
+void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid, Vector<T,2> origin, Vector<T,2> extend)
+{
+ OstreamManager clout(std::cout,"prepareGeometry");
+ clout << "Prepare Geometry ..." << std::endl;
+
+ auto& converter = grid.getConverter();
+ auto& sGeometry = grid.getSuperGeometry();
+
+ sGeometry.rename(0,1);
+
+ const T physSpacing = converter.getPhysDeltaX();
+
+ // Set material number for channel walls
+ {
+ const Vector<T,2> wallExtend { extend[0]+physSpacing/2, physSpacing/2 };
+ const Vector<T,2> wallOrigin = origin - physSpacing/4;
+
+ IndicatorCuboid2D<T> lowerWall(wallExtend, wallOrigin);
+ sGeometry.rename(1,2,lowerWall);
+ }
+ {
+ const Vector<T,2> wallExtend { extend[0]+physSpacing/2, physSpacing/2 };
+ const Vector<T,2> wallOrigin { origin[0]-physSpacing/4, extend[1]-physSpacing/4 };
+
+ IndicatorCuboid2D<T> upperWall(wallExtend, wallOrigin);
+ sGeometry.rename(1,2,upperWall);
+ }
+
+ // Set material number for inflow and outflow
+ {
+ const Vector<T,2> inflowExtend { physSpacing/2, extend[1]+physSpacing/4 };
+ const Vector<T,2> inflowOrigin = origin - physSpacing/4;
+
+ IndicatorCuboid2D<T> inflow(inflowExtend, inflowOrigin);
+ sGeometry.rename(1,3,inflow);
+ }
+ {
+ const Vector<T,2> outflowExtend { physSpacing/2, extend[1]+physSpacing/4 };
+ const Vector<T,2> outflowOrigin { extend[0]-physSpacing/4, origin[0]-physSpacing/4 };
+
+ IndicatorCuboid2D<T> outflow(outflowExtend, outflowOrigin);
+ sGeometry.rename(1,4,outflow);
+ }
+
+ // Set material number for vertically centered cylinder
+ {
+ const Vector<T,2> cylinderOrigin = origin + Vector<T,2> {cylinderX, cylinderY};
+ IndicatorCircle2D<T> obstacle(cylinderOrigin, cylinderD/2);
+ sGeometry.rename(1,5,obstacle);
+ }
+
+ sGeometry.clean();
+ sGeometry.innerClean();
+ sGeometry.checkForErrors();
+
+ clout << "Prepare Geometry ... OK" << std::endl;
+}
+
+void disableRefinedArea(Grid2D<T,DESCRIPTOR>& coarseGrid,
+ RefiningGrid2D<T,DESCRIPTOR>& fineGrid)
+{
+ auto& sGeometry = coarseGrid.getSuperGeometry();
+ auto refinedOverlap = fineGrid.getRefinedOverlap();
+ sGeometry.reset(*refinedOverlap);
+}
+
+void prepareLattice(Grid2D<T,DESCRIPTOR>& grid)
+{
+ OstreamManager clout(std::cout,"prepareLattice");
+ clout << "Prepare lattice ..." << std::endl;
+
+ auto& converter = grid.getConverter();
+ auto& sGeometry = grid.getSuperGeometry();
+ auto& sLattice = grid.getSuperLattice();
+
+ Dynamics<T,DESCRIPTOR>& bulkDynamics = grid.addDynamics(
+ std::unique_ptr<Dynamics<T,DESCRIPTOR>>(
+ new BGKdynamics<T,DESCRIPTOR>(
+ grid.getConverter().getLatticeRelaxationFrequency(),
+ instances::getBulkMomenta<T,DESCRIPTOR>())));
+
+ sOnLatticeBoundaryCondition2D<T,DESCRIPTOR>& sBoundaryCondition = grid.getOnLatticeBoundaryCondition();
+ createInterpBoundaryCondition2D<T,DESCRIPTOR>(sBoundaryCondition);
+
+ const T omega = converter.getLatticeRelaxationFrequency();
+
+ sLattice.defineDynamics(sGeometry, 0, &instances::getNoDynamics<T,DESCRIPTOR>());
+ sLattice.defineDynamics(sGeometry, 1, &bulkDynamics); // bulk
+ sLattice.defineDynamics(sGeometry, 2, &bulkDynamics); // walls
+ sLattice.defineDynamics(sGeometry, 3, &bulkDynamics); // inflow
+ sLattice.defineDynamics(sGeometry, 4, &bulkDynamics); // outflow
+ sLattice.defineDynamics(sGeometry, 5, &instances::getBounceBack<T,DESCRIPTOR>()); // cylinder
+
+ sBoundaryCondition.addVelocityBoundary(sGeometry, 2, omega);
+ sBoundaryCondition.addVelocityBoundary(sGeometry, 3, omega);
+ sBoundaryCondition.addPressureBoundary(sGeometry, 4, omega);
+
+ AnalyticalConst2D<T,T> rho0(1.0);
+ AnalyticalConst2D<T,T> u0(0.0, 0.0);
+
+ auto materials = sGeometry.getMaterialIndicator({1, 2, 3, 4});
+ sLattice.defineRhoU(materials, rho0, u0);
+ sLattice.iniEquilibrium(materials, rho0, u0);
+
+ sLattice.initialize();
+
+ clout << "Prepare lattice ... OK" << std::endl;
+ sGeometry.print();
+}
+
+void setBoundaryValues(Grid2D<T,DESCRIPTOR>& grid, int iT)
+{
+ auto& converter = grid.getConverter();
+ auto& sGeometry = grid.getSuperGeometry();
+ auto& sLattice = grid.getSuperLattice();
+
+ const int iTmaxStart = converter.getLatticeTime(0.4*16);
+ const int iTupdate = 5;
+
+ if ( iT % iTupdate == 0 && iT <= iTmaxStart ) {
+ PolynomialStartScale<T,T> StartScale(iTmaxStart, 1);
+
+ T iTvec[1] { T(iT) };
+ T frac[1] { };
+ StartScale(frac, iTvec);
+
+ const T maxVelocity = converter.getCharLatticeVelocity() * 3./2. * frac[0];
+ Poiseuille2D<T> u(sGeometry, 3, maxVelocity, deltaR/2);
+
+ sLattice.defineU(sGeometry, 3, u);
+ }
+}
+
+void getResults(const std::string& prefix,
+ Grid2D<T,DESCRIPTOR>& grid,
+ int iT)
+{
+ OstreamManager clout(std::cout,"getResults");
+
+ auto& converter = grid.getConverter();
+ auto& sLattice = grid.getSuperLattice();
+ auto& sGeometry = grid.getSuperGeometry();
+
+ SuperVTMwriter2D<T> vtmWriter(prefix + "cylinder2d");
+ SuperLatticePhysVelocity2D<T,DESCRIPTOR> velocity(sLattice, converter);
+ SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure(sLattice, converter);
+ SuperLatticeGeometry2D<T,DESCRIPTOR> geometry(sLattice, sGeometry);
+ SuperLatticeKnudsen2D<T,DESCRIPTOR> knudsen(sLattice);
+ vtmWriter.addFunctor(geometry);
+ vtmWriter.addFunctor(velocity);
+ vtmWriter.addFunctor(pressure);
+ vtmWriter.addFunctor(knudsen);
+
+ if (iT==0) {
+ vtmWriter.createMasterFile();
+ }
+
+ vtmWriter.write(iT);
+}
+
+void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid)
+{
+ static T maxDrag = 0.0;
+
+ OstreamManager clout(std::cout,"measurement");
+
+ auto& sLattice = grid.getSuperLattice();
+ auto& sGeometry = grid.getSuperGeometry();
+ auto& converter = grid.getConverter();
+
+ SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure(sLattice, converter);
+ AnalyticalFfromSuperF2D<T> intpolatePressure(pressure, true);
+ SuperLatticePhysDrag2D<T,DESCRIPTOR> dragF(sLattice, sGeometry, 5, converter);
+
+ const T radiusCylinder = cylinderD/2;
+
+ const T point1[2] { cylinderX - radiusCylinder, cylinderY };
+ const T point2[2] { cylinderX + radiusCylinder, cylinderY };
+
+ T pressureInFrontOfCylinder, pressureBehindCylinder;
+ intpolatePressure(&pressureInFrontOfCylinder, point1);
+ intpolatePressure(&pressureBehindCylinder, point2);
+
+ T pressureDrop = pressureInFrontOfCylinder - pressureBehindCylinder;
+ clout << "pressureDrop=" << pressureDrop;
+
+ const int input[3] {};
+ T drag[dragF.getTargetDim()] {};
+ dragF(drag, input);
+ if (drag[0] > maxDrag) {
+ maxDrag = drag[0];
+ };
+ clout << "; drag=" << drag[0] << "; maxDrag: " << maxDrag << "; lift=" << drag[1] << endl;
+}
+
+int main(int argc, char* argv[])
+{
+ olbInit(&argc, &argv);
+ singleton::directories().setOutputDir("./tmp/");
+ OstreamManager clout(std::cout,"main");
+
+ const Vector<T,2> coarseOrigin {0.0, 0.0};
+ const Vector<T,2> coarseExtend {lx, ly};
+ IndicatorCuboid2D<T> coarseCuboid(coarseExtend, coarseOrigin);
+
+ Grid2D<T,DESCRIPTOR> coarseGrid(
+ coarseCuboid,
+ RelaxationTime<T>(tau),
+ N,
+ PhysCharacteristics);
+ const Vector<T,2> domainOrigin = coarseGrid.getSuperGeometry().getStatistics().getMinPhysR(0);
+ const Vector<T,2> domainExtend = coarseGrid.getSuperGeometry().getStatistics().getPhysExtend(0);
+
+ prepareGeometry(coarseGrid, domainOrigin, domainExtend);
+
+ const auto coarseDeltaX = coarseGrid.getConverter().getPhysDeltaX();
+
+ const Vector<T,2> fineExtend {10*cylinderD, domainExtend[1]-4*coarseDeltaX};
+ const Vector<T,2> fineOrigin {0.5*cylinderD, (domainExtend[1]-fineExtend[1])/2};
+
+ auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
+ prepareGeometry(fineGrid, domainOrigin, domainExtend);
+ disableRefinedArea(coarseGrid, fineGrid);
+
+ const Vector<T,2> fineExtend2 {6*cylinderD, fineGrid.getExtend()[1]-4*coarseDeltaX};
+ const Vector<T,2> fineOrigin2 {0.75*cylinderD, (domainExtend[1]-fineExtend2[1])/2};
+
+ auto& fineGrid2 = fineGrid.refine(fineOrigin2, fineExtend2);
+ prepareGeometry(fineGrid2, domainOrigin, domainExtend);
+ disableRefinedArea(fineGrid, fineGrid2);
+
+ const Vector<T,2> fineExtend3 {4*cylinderD, 2*cylinderD};
+ const Vector<T,2> fineOrigin3 {1*cylinderD, (domainExtend[1]-fineExtend3[1])/2};
+
+ auto& fineGrid3 = fineGrid2.refine(fineOrigin3, fineExtend3);
+ prepareGeometry(fineGrid3, domainOrigin, domainExtend);
+ disableRefinedArea(fineGrid2, fineGrid3);
+
+ const Vector<T,2> fineExtend4 {1.25*cylinderD, 1.25*cylinderD};
+ const Vector<T,2> fineOrigin4 {cylinderX - fineExtend4[0]/2, cylinderY - fineExtend4[1]/2};
+
+ auto& fineGrid4 = fineGrid3.refine(fineOrigin4, fineExtend4);
+ prepareGeometry(fineGrid4, domainOrigin, domainExtend);
+ disableRefinedArea(fineGrid3, fineGrid4);
+
+ prepareLattice(coarseGrid);
+ prepareLattice(fineGrid);
+ prepareLattice(fineGrid2);
+ prepareLattice(fineGrid3);
+ prepareLattice(fineGrid4);
+
+ clout << "Total number of active cells: " << coarseGrid.getActiveVoxelN() << endl;
+ clout << "Starting simulation..." << endl;
+
+ const int statIter = coarseGrid.getConverter().getLatticeTime(0.05);
+ Timer<T> timer(
+ coarseGrid.getConverter().getLatticeTime(maxPhysT),
+ coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
+ timer.start();
+
+ for (int iT = 0; iT <= coarseGrid.getConverter().getLatticeTime(maxPhysT); ++iT) {
+ setBoundaryValues(coarseGrid, iT);
+
+ coarseGrid.collideAndStream();
+
+ if (iT%statIter == 0) {
+ timer.update(iT);
+ timer.printStep();
+
+ getResults("level0_", coarseGrid, iT);
+ getResults("level1_", fineGrid, iT);
+ getResults("level2_", fineGrid2, iT);
+ getResults("level3_", fineGrid3, iT);
+ getResults("level4_", fineGrid4, iT);
+
+ takeMeasurements(fineGrid4);
+ }
+ }
+
+ timer.stop();
+ timer.printSummary();
+}